The header area is unstable in Windows 7, 64 bit. I do not see multiple tabls or close/minimise/etc symbols.
I have the same issue with the 32 bit version. Sometimes I can see more than one tab (when I have them open) and sometimes not. The underscore, minn/max and close symbols are missing. If I have tabs open into the area where these symbols should be, clicking on the X for the tab sometimes closes the tab and sometimes closes Firefox. I have to watch to make sure that the tab X is lit before I click.
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Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh).
Is the problem still there?
Yes, the problem is still there.
That is odd.
Do you have the problem with other windows or just Firefox?
Start your Computer in safe mode with networking. Then start Firefox. Try Safe websites. Is the problem still there?